参数资料
型号: MAX1977EEI+T
厂商: Maxim Integrated Products
文件页数: 16/32页
文件大小: 0K
描述: IC CNTRLR PS QUAD HI EFF 28QSOP
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
应用: 控制器,笔记本电脑电源系统
输入电压: 4.5 V ~ 24 V
输出数: 4
输出电压: 3.3V,5V,2 V ~ 5.5 V
工作温度: 0°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 28-QSOP
供应商设备封装: 28-QSOP
包装: 带卷 (TR)
High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
MAX1977 is optimized for “thin and light” applications with a
5V/400kHz SMPS and a 3.3V/500kHz SMPS. The MAX1999
provides a pin-selectable switching frequency, allowing
either 200kHz/300kHz or 400kHz/500kHz operation of the
5V/3.3V SMPSs, respectively.
Light-load efficiency is enhanced by automatic Idle
Mode? operation, a variable-frequency pulse-skipping
mode that reduces transition and gate-charge losses.
MAX1777/
MAX1977/
MAX1999
TON
(MAX1999 ONLY)
BST3
DH3
LX3
V+
Each step-down, power-switching circuit consists of two
N-channel MOSFETs, a rectifier, and an LC output filter.
The output voltage is the average AC voltage at the
switching node, which is regulated by changing the duty
cycle of the MOSFET switches. The gate-drive signal to
the N-channel high-side MOSFET must exceed the
battery voltage, and is provided by a flying-capacitor
boost circuit that uses a 100nF capacitor connected to
BST_.
PGOOD
PGOOD3
PGOOD5
BST5
DH5
3.3V
5V
LX5
DL3
CS3
(MAX1777/
MAX1977)
ILIM3
LDO5
SMPS PWM
CONTROLLER
SMPS PWM
CONTROLLER
LDO5
DL5
CS5
(MAX1777/
MAX1977)
ILIM5
FB3
FB5
OUT3
OUT5
EN3
2.91V
4.56V
EN5
LDO3
3V
LINEAR
REG
5V
LINEAR
REG
LDO5
V CC
ON3
ON5
SHDN
PRO
POWER-ON SEQUENCE/
CLEAR FAULT LATCH
THERMAL
SHUTDOWN
2V
REFERENCE
REF
GND
Figure 3. Detailed Functional Diagram
Idle Mode is a trademark of Maxim Integrated Products, Inc.
16
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相关代理商/技术参数
参数描述
MAX1977EEI-TG068 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1978ETM 功能描述:电压模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel
MAX1978ETM+ 功能描述:电压模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel
MAX1978ETM+T 功能描述:电压模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel
MAX1978ETM-T 功能描述:电压模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel